Food Science and Preservation (한국식품저장유통학회지)

The Korean Society of Food Preservation (한국식품저장유통학회)
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Bioconversion of nutrient and phytoestrogen constituents during the solid-state fermentation of soybeans by mycelia of Tricholoma matsutake

송이버섯 균사체를 이용한 대두 고체발효 중 영양성분과 식물성 에스트로겐 성분의 생물전환

  • Hee Yul Lee (Department of GreenBio Science and Agri-Food Bio Convergence Institute, Gyeongsang National University) ;
  • Kye Man Cho (Department of GreenBio Science and Agri-Food Bio Convergence Institute, Gyeongsang National University) ;
  • Ok Soo Joo (Department of Food Science, Gyeongsang National University)
  • 이희율 (경상국립대학교 생명자원과학과 및 농식품바이오융복합연구원) ;
  • 조계만 (경상국립대학교 생명자원과학과 및 농식품바이오융복합연구원) ;
  • 주옥수 (경상국립대학교 식품공학부)
  • Received : 2023.08.11
  • Accepted : 2023.10.16
  • Published : 2023.12.30
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Abstract

The findings of this study confirmed the alteration of β-glucosidase activity, nutritional constituents, isoflavones, antioxidant activities, and digestive enzyme inhibition activities in soybeans during solid-state fermentation times with mycelia of Tricholoma matsutake. After nine days, the highest activity level was observed for β-glucosidase (3.90 to 38.89 unit/g) and aglycones (163.03 to 1,074.28 ㎍/g). The sum of isoflavones showed a significant decrease (3,489.41 to 1,325.66 ㎍/g) along with glycosides (2,753.87 to 212.43 ㎍/g) for fermentation, while fatty acids showed a slight increase and amino acids showed a marked increase. Total phenolic and flavonoid contents showed a corresponding increase according to fermentation times (5.58 to 15.09 GAE mg/g; 0.36 to 1.58 RE mg/g). Antioxidant and enzyme inhibition activities also increased; in particular, the highest level of scavenging activities was observed for ABTS (up 60.13 to 82.08%), followed by DPPH (up 63.92% to 71.98%) and hydroxyl (up 36.01 to 52.02%) radicals. Of particular interest, α-glucosidase (6.69 to 83.49%) and pancreatic lipase inhibition (1.22 to 77.43%) showed a marked increase. These results demonstrated that fermentation of soybeans with the mycelia of T. matsutake enhanced the nutritional and functional constituents, and the biological activities of soybeans. Thus, this fermentation technology can be used to produce a novel functional materials from soybeans.

본 연구에서는 송이버섯 균사체를 이용한 대두의 고체 발효 기간 중 β-glucosidase 활성, 유리아미노산, 지방산, 이소플라본 함량 및 항산화 활성과 소화효소 저해 활성 변화에 대해서 확인하였다. 발효 기간 중 β-glucosidase 활성은 증가하여 발효 9일 38.89 unit/g으로 최대치를 보였으며, 이에 상응하여 aglycones 함량이 발효 9일 최대 함량을 보였다(0일: 163.03 ㎍/g → 9일: 1,074.28 ㎍/g). 특히 daidzein과 genistein 함량은 발효 9일 43.90배(511.49 mg/g)와 37.04배(460.86 mg/g) 증가를 보였다. 총지방산 함량과 총유리아미노산 함량은 발효 12일 130.85 mg/g 및 80.47 mg/g으로 가장 높았다. 특히 유리아미노산 중 필수아미노산인 발효 0일과 비교해 발효 12일 BCAA는 36.82배(0.34 → 12.52 mg/g) 증가하였으며, 감칠맛(aspartic acid 및 glutamic acid)과 단맛(serine, glycine, alanine, threonine, valine 및 lysine)과 관련된 성분의 합은 8.73 배(4.23 → 36.91 mg/g) 증가하였다. TP 및 TF 함량은 발효 기간에 따라 증가하여 발효 12일 2.7배(15.09 GAE mg/g) 및 4.4배(1.58 RE mg/g) 증가를 보였다. 항산화 활성 성분의 경향과 마찬가지로 DPPH, ABTS 및 hydroxyl 라디칼 소거 활성 또한 발효 12일 가장 높은 함량을 보였으며, ABTS(82.08%) > DPPH(71.98%) > hydroxyl(52.02%) 순으로 높게 확인되었다. α-Glucosidase 및 췌장 lipase 저해 활성은 폴리페놀 화합물에 영향으로 발효 12일 83.49%와 77.73%로 발효 기간 중 가장 높은 저해 활성을 나타내었다. 본 연구 결과, 9일에서 12일 발효 시 발효물의 영양 성분, 항산화 물질, 항산화 활성 및 소화효소 저해 활성이 우수하였으며, 송이버섯 균사체를 이용한 대두 발효물이 기능성 식품 또는 기능성 식품 원료로 활용성이 높을 것으로 판단된다.

Keywords

Acknowledgement

This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (Grant number 2021R1A6A3A01087286).

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